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29 October, 16:07

How many moles of calcium atoms do you have if you have 3.00 * 10²¹ atoms of calcium. (The mass of one mole of calcium is 40.08 g.)

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Answers (2)
  1. 29 October, 19:04
    0
    4.98x10^-3 mole

    Explanation:

    According to Avogadro's hypothesis, 1 mole of any substance contains 6.02x10^23 atoms. This greatly implies that 1 mole of calcium will also contain 6.02x10^23 atoms.

    Now, if 1 mole of calcium contains 6.02x10^23 atoms,

    then Xmol of calcium will contain 3x10^21 atoms i. e

    Xmol of calcium = 3x10^21/6.02x10^23

    Xmol of calcium = 4.98x10^-3mol

    Therefore, 4.98x10^-3 mole of calcium contains 3x10^21 atoms
  2. 29 October, 20:06
    0
    0.0050moles

    Explanation:

    Since

    1 mole=6.022*10^23

    X mole=3.0*10^21

    Cross multiply

    6.022*10^23x=3.0*10^21

    Divide both sides by 6.022*10^23

    x=0.00498~0.0050moles

    So the final answer is 0.0050moles
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